As part of its $60-per-share hostile takeover bid for Airgas, Air Products & Chemicals has charged that Airgas founder and CEO Peter McCausland has engaged in insider trading. In a complaint filed in the Delaware Court of Chancery, Air Products says that on Jan. 5, McCausland exercised options to buy 150,000 Airgas shares for $5.50 per share and another 150,000 shares at $8.99. McCausland’s move came a month before the Air . . .